Overview
ISO 10768:2010 establishes a standardized test method to evaluate the fatigue resistance of elastic materials used in footwear. This international standard focuses on determining how well these elastic components withstand repeated extension during normal walking conditions. The testing protocol can be applied both before and after accelerated ageing, ensuring the durability and performance of elastic footwear materials over time. This standard applies to any elastic material integrated into footwear construction, supporting consistent quality assurance and product development.
Key Topics
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Scope of Testing
ISO 10768:2010 specifies testing of elastic materials’ ability to endure repeated stretching cycles, simulating the stresses experienced in real-life use. The standard covers:
- Elastic materials in footwear uppers, straps, and other flexible components.
- Testing conditions both pre- and post-accelerated ageing to assess durability over the product lifecycle.
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Sample Preparation and Conditioning
Samples are carefully prepared with specific dimensions and reinforced with coated fabric patches. Conditioning involves maintaining specimens at controlled temperature and humidity to simulate typical environmental factors before testing.
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Testing Procedure
Using a machine that imposes cyclic extensions at a rate of 60 cycles per minute, the elastic material is stretched from its minimum to a maximum distance simulating walking strain. The maximum extension is either 150% of the initial length or limited by the material’s elongation capacity as per ISO 10765. Testing continues up to 10,000 cycles or until material deterioration occurs.
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Assessment Criteria
The test measures:
- Number and percentage of elastic threads broken after repeated cycles.
- Visible signs of damage such as creases or permanent deformation.
If more than 10% of elastic threads are broken or heavy creasing is observed, the testing is concluded.
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Reporting
The final report includes:
- Reference to ISO 10768:2010.
- Complete description of the elastic material tested.
- Total cycles performed and observed deterioration.
- Results of tests post-accelerated ageing if applicable.
- Any deviations from the standard procedure.
Applications
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Footwear Manufacturing Quality Control
ISO 10768:2010 provides footwear manufacturers with a reliable method to verify the durability and performance of elastic components, ensuring products maintain comfort and fit throughout their use.
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Research and Development
This standard aids R&D teams in assessing new elastic materials and design improvements, enabling development of higher-performing footwear with longer-lasting elasticity.
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Material Supplier Certification
Suppliers of elastic materials for footwear can use this test method for product certification, assuring brands of compliance with international performance standards.
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Regulatory Compliance and Consumer Safety
The method supports adherence to consumer safety regulations by validating the fatigue resistance of elastic materials, thereby reducing the risk of premature failure that affects wearability or safety.
Related Standards
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ISO 10765: Footwear – Test method for characterization of elastic materials – Tensile performance. This standard complements ISO 10768 by defining the tensile behavior and elongation limits essential for fatigue testing.
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ISO 18454: Footwear – Standard atmospheres for conditioning and testing of shoes and components. This defines environmental conditions for consistent sample conditioning prior to testing.
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ISO 16187: Footwear – Test methods for upper materials, which may include guidance on evaluating other components interacting with elastic materials.
By aligning with these related standards, manufacturers and testers ensure comprehensive assessment processes for footwear elastic materials, contributing to high-quality, durable footwear products.
Keywords: ISO 10768:2010, fatigue resistance, elastic materials, footwear testing, repeated extension, accelerated ageing, shoe elastic durability, footwear quality control, elastic material fatigue test, footwear standards, elastic component testing.